PLB:
From your description, you should do nothing more to this gun than break it down for transport or basic cleaning. No slight intended. And the 21 needs little else unless grossly abused.
You are correct. The ejector mechanism is in the forearm. If it's not broke, don't fix it.
The rolling knurled wheel under the forearm unlocks the latch from the barrels. Roll the wheel with one thumb while you gently pull outward on the forearm with the other. It should come easily loose.
Next, grasp the barrels OVERHAND near the action, push the top lever right and open the gun. The barrels should turn off the action easily and render the gun into the three basic parts: buttstock, forearm and barrels.
Assemble carefully in reverse. You can't hurt much. It's a tough gun. But the NRA takedown description will give you more. Just don't consider stripping the gun to tiny bits. It's not necessary.
Best, Kensal
